> The neogeo bios does a test of the Z80, and hangs with an error message if the> Z80 behaves improperly.> > How much of the Z80 needs to be emulated to pass this test? Will the Z80 pass> on its own (with the ym2610 stubbed out), or does it need parts of the ym2610 as> well?>

As far as I remember you need to return 1 when read from address 0x320000. I think thats how removed the "Z80 Error" message.

stay safe,

AamirM

> To answer my own question for anyone who's curious:> > The bios will be happy with just the Z80. No ym2610 is needed.> > > The neogeo bios does a test of the Z80, and hangs with an error message if the> > Z80 behaves improperly.> > > > How much of the Z80 needs to be emulated to pass this test? Will the Z80 pass> > on its own (with the ym2610 stubbed out), or does it need parts of the ym2610> as> > well?> >>

> Hi,> > As far as I remember you need to return 1 when read from address 0x320000. I> think thats how removed the "Z80 Error" message.> > stay safe,> > AamirM> > > To answer my own question for anyone who's curious:> > > > The bios will be happy with just the Z80. No ym2610 is needed.> > > > > The neogeo bios does a test of the Z80, and hangs with an error message if> the> > > Z80 behaves improperly.> > > > > > How much of the Z80 needs to be emulated to pass this test? Will the Z80> pass> > > on its own (with the ym2610 stubbed out), or does it need parts of the> ym2610> > as> > > well?> > >> >>